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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
An experiment involving absorption of oxygen and its quantitative estimation would involve the use ofA. caustic sodaB. conc. `H_2SO_4`C. pyrogallolD. anhydrous `CaCl_2` |
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Answer» Correct Answer - C Oxygen is absorbed in Pyrogallol solution. |
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| 52. |
The oxidation number of sulphur in `Na_2S_4O_6` is .A. `2/3`B. `3/2`C. `3/5`D. `5/2` |
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Answer» Correct Answer - D Let O.S. of S in `Na_2S_4O_6`=x `therefore2xx(+1)+4xx x +6(-2)=0` 2+ 4x - 12 =0 `x=5/2` |
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| 53. |
The oxidation number of sulphur in `S_(8), S_(2)F_(2) and H_(2)S` respectively are:A. 0, +1 and -2B. +2, +1 and -2C. 0, +1 and +2D. -2, +1 and 2 |
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Answer» Correct Answer - A O.S. of sulphur is `S_8`=0 O.S. of sulphur in `S_2F_2`=+1 (O.S. of fluorine is always -1 ) O.S. of sulphur in `H_2S`= -2 (O.S. of hydrogen = +1). |
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| 54. |
In which of the following pairs of species, the oxidation states of oxygen and sulphur is same?A. `H_2S, OF_2`B. `H_2S,H_2O_2`C. `FeS_2, Na_2O_2`D. `Fe_2O_3, FeS_2` |
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Answer» Correct Answer - C In `FeS_2`, O.N. of S is -1, and also in `Na_2O_2`, O.N. of oxygen is -1. |
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| 55. |
Oxygen exhibits positive oxidation state inA. COB. `F_2O`C. NOD. `N_2O` |
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Answer» Correct Answer - B Oxygen exhibits positive oxidation state in compounds with fluorine because fluorine is more electronegative than oxygen. |
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| 56. |
In its compounds, oxygen can show oxidation state `(s)` ofA. `-1`B. `-2`C. `+1`D. `+2` |
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Answer» Correct Answer - A::B::C Oxygen can show an oxidation state of -2 (in oxides), -1(in peroxides) +1 (in `O_2F_2`) and +2 (in `OF_2`). |
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| 57. |
Oxidation state of oxygen is zero inA. COB. `O_3`C. `SO_2`D. `H_2O_2` |
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Answer» Correct Answer - B Oxidation state of O in `O_3` =0 (zero) O.S. of O in CO and `SO_2`=- 2 O.S. of O in `H_2O_2` = -1 |
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| 58. |
Which of the following does not exhibit `sp^3`- hybridisation ?A. `SO_2`B. `CH_4`C. `NH_3`D. `SO_4^2` |
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Answer» Correct Answer - A In `SO_2`, state of hybridisation of S is `sp^2` . In `CH_4`, C is `sp^3` hybridised. In `NH_3`, N is `sp^3` hybridised. In `SO_4^(2-)` , S is `sp^3` hybridised. |
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| 59. |
The highest ionization energy among the following group 16 elements is possessed byA. OxygenB. SulphurC. SeleniumD. Tellurium. |
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Answer» Correct Answer - A Down the group, due to increase in the size, ionisation energy decreases so oxygen has highest ionization energy. |
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| 60. |
The element with highest m.p. and b.p. in Group 16 isA. PoB. TeC. SeD. S |
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Answer» Correct Answer - B Melting point and boiling point of Te are more than Po. m.p. and b.p. increase down the group from O to Te. |
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| 61. |
Which among the following pairs does not contain allotropes ?A. Oxygen and ozoneB. Hydrogen and deuteriumC. Red phosphorus and yellow phosphorusD. Diamond and graphite. |
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Answer» Correct Answer - B Hydrogen and deuterium are isotopes and not allotropes. |
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| 62. |
Which of the following does not contain S-S bond ?A. Dithionic acidB. Pyrosulphuric acidC. Thiosulphuric acidD. None of these |
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Answer» Correct Answer - B Pyrosulphuric acid is `HO-undersetunderset(O)(||)oversetoverset(O)(||)S-O-undersetunderset(O)(||)oversetoverset(O)(||)S-OH` |
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| 63. |
When a colourless gas is passed through bromine water only decolourisation takes place The gas isA. `SO_2`B. HBrC. HCID. `H_2S` |
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Answer» Correct Answer - A `Br_2` cannot oxidise HBr or HCl. `Br_2` oxidises `H_2S` to S. `H_2S+Brto2HBr + S` In the reaction, brown colour of the `Br_2` water is decolourised but milkiness due to colloidal sulphur appears. `Br_2` oxidise `SO_2` to `H_2SO_4` `({:(" "Br_2+H_2O,to2HBr+O),(H_2O+SO_2+O,toH_2SO_4):})/ul(Br_2+2H_2O+SO_2to2HBr+H_2SO_4)` In this reaction only decolorization of `Br_2` takes place. |
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| 64. |
`SO_(2)` reacts with chlorine in sunlight to form :A. Sulphuryl chlorideB. Sulphonyl chlorideC. Sulphur dioxideD. none of these |
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Answer» Correct Answer - A `SO_2+ Cl_2 overset("Sunlight")toSO_2Cl_2`(Sulphonyl chloride) |
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| 65. |
When conc. `H_2SO_4` is added to dry `KNO_3` brown fumes evolve. These are ofA. `SO_2`B. `SO_3`C. `NO_2`D. NO |
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Answer» Correct Answer - C In this reaction brown fumes of `NO_2` gas are evolved |
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| 66. |
Which type of bond is there in `H_2S` molecules ?A. IonicB. CovalentC. CoordinateD. All of these. |
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Answer» Correct Answer - B `H_2S (H - underset(ddot)overset(ddot)S -H)` molecule contains two covalent bond. |
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| 67. |
All the elements of oxygen family areA. Non metalsB. MetalloidsC. RadioactiveD. Polymorphic |
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Answer» Correct Answer - D All elements of oxygen family are non-metals. |
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| 68. |
Which of the following on reaction with `H_(2)S` does not produce metallic sulphide ?A. `CdCl_2`B. `ZnCl_2`C. `COCI_2`D. `CuCl_2` |
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Answer» Correct Answer - C `H_2S` does not produce metallic sulphide with `COCl_2` (phosgene) because `COCl_2` does not contain any metal ion. |
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| 69. |
Which of the following isoelectronic ions has the lowest ionization energy?A. `K^+`B. `Ca^(2+)`C. `Cl^-`D. `S^(2-)` |
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Answer» Correct Answer - D Nuclear charge on `K^(+),Ca^(2+),Cl^(-) and S^(2-)` are 19,20,17 and 16 respectively. Lesser the nuclear charge, lesser is the ionisation energy.Thus ionisation energy of `S^(2-)` is least. |
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| 70. |
The compound which gives oxygen on moderate heating isA. cupric oxideB. mercuric oxideC. zinc oxideD. aluminium oxide. |
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Answer» Correct Answer - B Mercuric oxide gives oxygen on moderate heating. `2HgO overset(Delta)to2Hg+O_2` |
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| 71. |
The number of lone pairs and the number of `S-S` bonds in `S_(8)` molecules are respectivelyA. 8,8B. 16,8C. 8, 16D. 8,4 |
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Answer» Correct Answer - B `S_8` molecule is There are 8 S-S bonds and 16 lone pairs. |
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| 72. |
`SF_6` exists but `OF_6` does not becauseA. d-orbitals of sulphur are vacant and are available for bondingB. more bonding electrons can be accomodated in orbitals with n = 3C. sulphur has larger ionization energy than oxygenD. the difference of electronegativity is less between oxygen and fluorine. |
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Answer» Correct Answer - A Vacant d-orbitals are present in sulphur and absent in oxygen |
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| 73. |
Of the following sets ,which one does not contain isoeletronic species ?A. `PO_4^3 , SO_4^(2), ClO_4`B. `CN^(-),N_2,C_2^(2-)`C. `SO_3^(2), CO_3^(2), NO_3`D. `BO_3^3 , CO_3^2 , NO_3` |
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Answer» Correct Answer - C `SO_3^(2-)` (42 electrons) , `CO_3^(2-)` (32 electrons ) and `NO_3^(3-)` (32 electrons) are not isoelectric. |
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| 74. |
A colourless gas with smell of rotten fish isA. `H_2S`B. `PH_3`C. `SO_2`D. None of these |
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Answer» Correct Answer - B Phosphene, `PH_3` is a colourless gas with a smell of rotten fish. |
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| 75. |
Colloidal sulphur is obtained by the action of `HNO_(3)` onA. `Na_2S_2O_3 + I_2`B. `H_2S_2O_8 + H_2SO_4`C. `FeCl_3 + H_2S`D. `FeCl_2 +H_2S ` |
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Answer» Correct Answer - C `2FeCl_3 + H_2S to 2FeCl_2 + 2HCl +S` |
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| 76. |
Colloidal sulphur is obtained whenA. sulphur is treated with `H_2SO_4`B. sulphur is strongly heatedC. sulphur is heated with `HNO_3`D. `H_2S` gas is passed through dil. `HNO_3`. |
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Answer» Correct Answer - C `H_2S+2HNO_3 to 2NO_2+ underset("Colloidal")(S)+2H_2O` |
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| 77. |
Which of the following non-metals does not combine with sulphur ?A. FluorineB. HydrogenC. PhosphorusD. lodine. |
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Answer» Correct Answer - D Iodine does not combine with sulphur. All the three others combine |
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| 78. |
Water has maximum density atA. 273 K (in liquid state)B. 298 KC. 373 K (in liquid state)D. None of these. |
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Answer» Correct Answer - D Water has maximum density at 277 K |
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| 79. |
Electrical conductivity of Se is negligible in dark but increases on exposure to light. Due to this property it is used inA. Photoelectric cellsB. SemiconductorsC. High voltage BatteriesD. Lasers |
| Answer» Correct Answer - A | |
| 80. |
Which show maximum catenation property ?A. SB. SeC. TeD. O |
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Answer» Correct Answer - A In Group 16 (oxygen family) maximum catenation is shown by sulphur. |
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| 81. |
In the reaction `2Ag+H_2SO_4 to Ag_2SO_4+2H_2O+SO_2+H_2SO_4` acts as :A. Reducing agent as well as acidB. Oxidising agent as well as acidC. Catalytic agentD. Dehydrating agent as well as acid |
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Answer» Correct Answer - B In this reaction, `H_2SO_4` acts both as oxidising agent as well as acid. |
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| 82. |
Ozone is notA. An allotropeB. A powerful oxidising agentC. ParamagneticD. A bent molecule |
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Answer» Correct Answer - C Ozone, `O_3` is not paramagnetic |
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| 83. |
Which liberates `SO_2` with dil. `H_2SO_4`?A. `Na_2SO_4`B. `NaHSO_4`C. `Na_2SO_3`D. `Na_2S` |
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Answer» Correct Answer - C `Na_2SO_3 + H_2SO_4 (dil.) to NaSO_4 +SO_2 +H_2O` |
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| 84. |
Which of the following does not exist ?A. `S_2Cl_2`B. `Se_2 Cl_2`C. `Te_2Cl_2`D. `OF_2` |
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Answer» Correct Answer - C Dimeric monohalides are formed by sulphur and selenium only |
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| 85. |
Which of the following elements does not show an oxidation state higher than +2 ?A. OxygenB. SulphurC. SeleniumD. Tellurium. |
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Answer» Correct Answer - A Oxygen does not show an oxidation state more than +2 due to absence of vacant d-orbitals. |
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| 86. |
The element of Group 16, which never shows negative oxidation state isA. PoB. TeC. SeD. None of these. |
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Answer» Correct Answer - A Polonium never shows negative oxidation state. |
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| 87. |
Assertion (A) : `BaCl_2` (aq) gives white ppt. of BaS with a solution containing `S^(2-)` ions. Reason (R) :BaS is a white coloured insoluble compoundA. Both A and R true and R is the correct explanation of AB. Both A and R true and R is not a correct explanation of AC. A is true but R is falseD. Both A and R are false |
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Answer» Correct Answer - D `BaCl_2` (aq) cannot be used to test for `S^(2-)` as BaS is soluble in water. |
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| 88. |
The number of electrons that are paired in oxygen molecule isA. 16B. 12C. 14D. 7 |
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Answer» Correct Answer - C In `O_2` molecule, there are two unpaired electrons Therefore, number of paired electrons = 8 x 2 -2 =14 . |
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| 89. |
Reducing property of `SO_2` is shown in the reactionA. `2H_2S + SO_2 to 3S + 2H_2O`B. `I_2 + SO_2 + 2H_2O to SO_4^(-2) + 2I^(-) + 4H^(+)`C. `3Fe+SO_2 to 2FeO +FeS`D. None of these. |
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Answer» Correct Answer - B `overset((+4))(SO_2)tooverset((+6))(SO_4^(2-))` Sulphur is oxidized from +4 to +6 state and reduces lodine. |
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| 90. |
Which of the following is the wrong statement ?A. Ozone is violet-black in solid stateB. Ozone is diamagnetic gasC. ONCI and `ONO^(-)` are not isoelectronicD. `O_3` molecule is bent |
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Answer» Correct Answer - B `O_3` does not absorb infrared radiation. |
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| 91. |
When a lead storage battery is discharged:A. `SO_2` is dissolvedB. Lead sulphate is consumedC. Lead is formedD. Sulphuric acid is consumed. |
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Answer» Correct Answer - D `H_2SO_4` is consumed, when a lead storage battery is discharged. `Pb(s) + PbO_2(s) +2H_2SO_4 (aq) to 2PBSO_4(s) 2H_2O` |
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| 92. |
The acid used in lead storage cells isA. Phosphoric acidB. Nitric acidC. Sulphuric acidD. Hydrochloric acid. |
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Answer» Correct Answer - C Sulphuric acid is used in lead storage cell. |
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| 93. |
The products of the chemical reaction between `Na_(2)S_(2)O_(3)`, `CI_(2)` and `H_(2)O` areA. S + HCl + `Na_2S`B. S + HCL + `Na_2SO_4`C. S + HCl + `Na_2SO_3`D. S + `NaHClO_3 + H_2O` |
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Answer» Correct Answer - B `({:(Cl_2+H_2Oto,2HCl+O),(Na_2S_2O_3to,Na_2SO_4+S):})/ul(Cl_2+H_2O+Na_2S_2O_3to2HCl +S+Na_2SO_4)` |
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| 94. |
Which is the best oxidising agent among the following ?A. SB. OC. SeD. Te |
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Answer» Correct Answer - B Oxidising ability depends upon the ability of an element to accept electrons. More the ability to accept electrons, stronger is the oxidising agent. Thus O is the strongest oxidising agent amongst group 16 elements |
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| 95. |
On heating `KClO_(3)` we get:A. `KClO_2 + O_2`B. `KCl+O_2`C. `KCl+O_3`D. `KCl+O_2 +O_3` |
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Answer» Correct Answer - B `2KClO_3 overset(Delta)to2KCl + 3O_2`. |
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| 96. |
Ozone is formed by the interaction of water andA. Potassium chlorideB. ChlorineC. Potassium fluorideD. Fluorine. |
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Answer» Correct Answer - D `3F_2+3H_2Oto6HF+O_3` |
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| 97. |
In the laboratory `SO_2` is collectedA. by downward displacement of airB. by upward displacement of airC. over waterD. by downward displacement of water. |
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Answer» Correct Answer - B As `SO_2` is heavier than air, so it is collected by upward displacement of air. |
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| 98. |
Dilute solutions of `H_2O_2` cannot be concentrated byA. vacuum distillationB. treatment with `P_2O_5`C. fractional crystallization at lower temperaturesD. careful and slow evaporation in a shallow dish. |
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Answer» Correct Answer - B `P_2O_5` is not used for this purpose. |
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| 99. |
`S^(2-)` Cannot be tested withA. `BaCl_2` solutionB. lead acetate solutionC. sodium nitroprussideD. dil. `H_2SO_4` test. |
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Answer» Correct Answer - A `S^(2-)` do not give white ppt. with `BaCl_2` (aq). |
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| 100. |
Heavy water isA. `H_2^(18)O`B. Water obtained by repeated distillationC. `D_2O`D. Water at `4^(@)C`. |
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Answer» Correct Answer - C Heavy water is `D_2O` |
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